He is the founding chairman of the Free Saxons and was a member of Citizens' Movement Pro Chemnitz, the German Social Union and The Republicans.

He is being monitored by the Saxony State Office for the Protection of the Constitution, which recognises him as a "long-standing activist in the right-wing extremist scene".

The case concerned a dispute in a law lecture at a first-semester information event with Kern in the fraternity house of the Burschenschaft Arminia zu Leipzig [de].

[4] In mid-October 2017, he was named by the Reichsbürger movement supporter Adrian Ursache as the third criminal defence attorney alongside the two public defenders in the ongoing trial.

[6] After informing the court, the Saxony Bar Association initiated proceedings against Kohlmann and examined his conduct in this regard from a professional perspective.

The Georgian chairman of the cultural association "Tolstoi e. V." introduced numerous asylum seekers to Kohlmann as clients due to his knowledge of Russian.

On 8 November 2022, Kohlmann was sentenced by the Chemnitz District Court to a fine of 120 daily rates of 50 euros each for incitement to hatred.

[17] In March 2006, Kohlmann switched to the German Social Union (DSU) and wanted to run for them in the mayoral election.

At the end of April 2009, during a city council meeting, Kohlmann called Mayor Berthold Brehm [de] (CDU), who had had removed from a school mural, a "cultural Taliban" and an "iconoclast".

He was subsequently sentenced by the Chemnitz District Court [de] to a fine of 2,275 euros for trespassing, but acquitted of the charges of insulting Brehm and Gintschel.

[22][23] Kohlmann had previously proposed to all of the incumbent's challengers that they agree on a new, non-partisan candidate for the new election and forego a re-election in his favour, but was unable to prevail.

On 27 August 2018, Kohlmann organized a demonstration in connection with the fatal knife attack on a German-Cuban in Chemnitz, from which he did not exclude the right-wing extremist NPD.

In connection with the knife attack in Chemnitz, Kohlmann spoke out in favour of Saxony's autonomy and rapprochement with Poland, Hungary and the Czech Republic.

[24] Within a few months, the organization has succeeded in taking control of the discourse on Telegram, which had 150,000 subscribers as of February 2022,[25] and influential in the organising of the Corona protests in Saxony.

[26] Programmatically, they are calling for closer cooperation with the nations in the Visegrád Group, with which they have more in common in terms of security or family policy than with the states of Western Germany.

Since January 2022, the Free Saxons have been classified as a suspected case by the Federal Office for the Protection of the Constitution and are being monitored nationwide.

In September 2023, Kohlmann explained that the Free Saxons' reasons for running in the 2024 local elections were that they wanted to gain information in local parliaments; in addition, potential city and municipal councillors should acquire skills and knowledge of public administration so that they could fall back on such people after a "change".

However, the Free Saxons would not become "part of the system" by running in elections, because they were "not there as friends and to support the whole thing, but to look around, to learn from the opponent and to make life more difficult for him".